[sdiy] saw-to-tri (was Re: Voltage Controlled Waveshape)

[harrybissell]

Actually this morphing is very easy with a pot... it is really a pretty GOOD
variable resistance... the end resistance is usually an ohm or so (or less) so
in
a 100K pot the percentage error is really small. And it has NO offset voltage,
leakage etc. Temperature variations probably affect both sides at one...

The hard part is to replace this circuit with one that electronically emulates
this
simple (lovely) three terminal device.  That's the rub

(and Vactrols don't do it well...)

john mahoney wrote:

> Talk about prior art, I happened upon an early example of this while leafing
> through my new Analogue Synths from A-Z books: The PAiA Gnome, circa 1974,
> had a "skew" knob for morphing from triangle to sawtooth. This function was
> not voltage controlled, though.
> --
> john
>
> ----- Original Message -----
> From: "Magnus Danielson" <cfmd at swipnet.se>
> > > > I believe Wavemakers was the first to interpolate between VCO
> waveforms,
> > > > in the 652 Dual Voice Subsystem:
> > > > http://www.wavemakers-synth.com/652pg1.html, in 1980. In Wavemakers